<div class="row">
  <div class="col-xs-6">
    <div ngbDropdown class="d-inline-block">
      <button class="btn btn-outline-primary" id="dropdownMenu1" ngbDropdownToggle>Toggle dropdown</button>
      <div class="dropdown-menu" aria-labelledby="dropdownMenu1">
        <button class="dropdown-item">Action - 1</button>
        <button class="dropdown-item">Another Action</button>
        <button class="dropdown-item">Something else is here</button>
      </div>
    </div>
  </div>